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| Case | Control | |
|---|---|---|
| Age category | No. (%) | No. (%) |
| 0–12 months | 811 (19.3) | 846 (13.4) |
| 13–24 months | 1096 (26.1) | 1812 (28.6) |
| 25–36 months | 875 (20.8) | 1412 (22.3) |
| 37–48 months | 828 (19.7) | 1304 (20.6) |
| 49–60 months | 591 (14.1) | 952 (15.1) |
| Total | 4201 (100) | 6326 (100) |
